..$ rails s => Booting WEBrick => Rails 4.0.4 application starting in development on http://0.0.0.0:3000 => Run `rails server -h` for more startup options =>
Kill server.pid by using command:
kill -9 `cat /root/myapp/tmp/pids/server.pid`
Note: Use your server.pid path which display in console/terminal.
Thank you.